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Building and outdoor wood boiler

I just finished welding the water jacket for the boiler. I had no major leaks but many pinhole leaks and i was wondering if anyone had any idea's on what i could put on the welds or in the water to stop the pinhole leaks. Thanks.

I just finished welding the water jacket for the boiler. I had no major leaks but many pinhole leaks and i was wondering if anyone had any idea's on what i could put on the welds or in the water to stop the pinhole leaks. Thanks.

The pinholes are called "porosity" and it means it was not welded properly.

It needs to be ground out or cut out with a torch, properly prepared, and re-welded.

80% of failures are from 20% of causesNever compromise your principles today in the name of furthering them in the future."All I ever wanted was an honest week's pay for an honest day's work." -Sgt. Bilko"We are generally better persuaded by reasons we discover ourselves than by those given to us by others." -Pascal"Since we cannot know all that there is to be known about anything, we ought to know a little about everything." -Pascal

Its a very good thing that u have the brains and the ***** to tackle a project such as a boiler. Based on whatever design you have created though, you have the potential for a very serious explosion and knowing the limits of your skill could save your life and or property. Have u installed any kind of pressure relief or is there any built in redundancy in your design. For your own safety and piece of mind, groove out and reweld or have it professionally welded.

Loctite 290 (green wicking grade)

You can coat the inside and outside of the weld with loctite 290 as it will wick into the porosity - penetrate deep - and seal it up both air and water tight; but I would only suggest this in a maintenance capacity as a quick temporary fix on something un-pressurized. It will take boiling water temps no-problem but you throw pressure into the mix and it will blow out the weakest link.

You could drain it and dry out the welds by heating them up a little with a rosebud torch, then squirt on the loctite 290 and it will wick right in and seal up. Although, considering you are building something new, you should re-do it right.